Poland is cutting aid because they're spending large amounts of money on defence. Poland knows it is vulnerable due to its geography. I know the days are gone where large armies march across open plains but what we're seeing in Ukraine is a war of attrition, and geography plays an important role even today.

Russia is highly unlikely to invade Poland, due to the fact Poland is a NATO member, but if Russia ever gets to the point where they think "fuck NATO" and go balls deep, Poland is the first to get bogged down in a land war.

Also, that article makes clear that Poland has already donated what it can and this statement is "largely rhetoric", probably intended for Polish people.